<!DOCTYPE html>
<html>

<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
    .login-header {
      width: 100%;
      text-align: center;
      height: 30px;
      font-size: 24px;
      line-height: 30px;
    }

    ul,
    li,
    ol,
    dl,
    dt,
    dd,
    div,
    p,
    span,
    h1,
    h2,
    h3,
    h4,
    h5,
    h6,
    a {
      padding: 0px;
      margin: 0px;
    }

    .login {
      display: none;
      width: 512px;
      height: 280px;
      position: fixed;
      border: #ebebeb solid 1px;
      left: 50%;
      top: 50%;
      background: #ffffff;
      box-shadow: 0px 0px 20px #ddd;
      z-index: 9999;
      transform: translate(-50%, -50%);
    }

    .login-title {
      width: 100%;
      margin: 10px 0px 0px 0px;
      text-align: center;
      line-height: 40px;
      height: 40px;
      font-size: 18px;
      position: relative;
      cursor: move;
    }

    .login-input-content {
      margin-top: 20px;
    }

    .login-button {
      width: 50%;
      margin: 30px auto 0px auto;
      line-height: 40px;
      font-size: 14px;
      border: #ebebeb 1px solid;
      text-align: center;
    }

    .login-bg {
      display: none;
      width: 100%;
      height: 100%;
      position: fixed;
      top: 0px;
      left: 0px;
      background: rgba(0, 0, 0, .3);
    }

    a {
      text-decoration: none;
      color: #000000;
    }

    .login-button a {
      display: block;
    }

    .login-input input.list-input {
      float: left;
      line-height: 35px;
      height: 35px;
      width: 350px;
      border: #ebebeb 1px solid;
      text-indent: 5px;
    }

    .login-input {
      overflow: hidden;
      margin: 0px 0px 20px 0px;
    }

    .login-input label {
      float: left;
      width: 90px;
      padding-right: 10px;
      text-align: right;
      line-height: 35px;
      height: 35px;
      font-size: 14px;
    }

    .login-title span {
      position: absolute;
      font-size: 12px;
      right: -20px;
      top: -30px;
      background: #ffffff;
      border: #ebebeb solid 1px;
      width: 40px;
      height: 40px;
      border-radius: 20px;
    }
  </style>
</head>

<body>
<div class="login-header"><a id="link" href="javascript:;">点击，弹出登录框</a></div>
<div id="login" class="login">
  <div id="title" class="login-title">登录会员
    <span><a id="closeBtn" href="javascript:void(0);" class="close-login">关闭</a></span>
  </div>
  <div class="login-input-content">
    <div class="login-input">
      <label>用户名：</label>
      <input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input">
    </div>
    <div class="login-input">
      <label>登录密码：</label>
      <input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input">
    </div>
  </div>
  <div id="loginBtn" class="login-button"><a href="javascript:void(0);" id="login-button-submit">登录会员</a></div>
</div>
<!-- 遮盖层 -->
<div id="bg" class="login-bg"></div>
<script>
  var link = document.querySelector('#link');
  var login = document.querySelector('.login');
  var loginbg = document.querySelector('.login-bg');
  var closeBtn = document.querySelector('#closeBtn');

  var title = document.querySelector('#title');


  link.addEventListener('click', function () {
    login.style.display = 'block';
    loginbg.style.display = 'block';
  })

  closeBtn.addEventListener('click', function () {
    login.style.display = 'none';
    loginbg.style.display = 'none';
  })

  title.addEventListener('mousedown', function (e) {
    var initX = e.pageX - login.offsetLeft;
    var initY = e.pageY - login.offsetTop;

    function move (e) {
      login.style.left = e.pageX - initX + 'px';
      login.style.top = e.pageY - initY + 'px';
    }

    document.addEventListener('mousemove', move);



    document.addEventListener('mouseup', function () {
      document.removeEventListener('mousemove', move);
    })
  })





</script>
</body>

</html>